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Spectral sensitivities of photoreceptors in the nocturnal M. vindex as determined by intracellular recordings (mean ± s.d.; N, sample number). Recordings were divided into (a) narrow- and (b) broad-band spectral sensitivity with a distinct secondary peak. The three types of photoreceptors have peak sensitivities (λmax) at 370 nm (UV, black curve), 450 nm (blue, blue curve) and 550 nm (green, green curve). (Online version in colour.)
